Muffler.



` `'rnruinas. "r. rvnnr, or'r nnooxLYN, New Yoan.

MUrrLnn. v

To aZZfwhom/z't may concemzx Be it known that I, THOMAS T. Tvnnir, a.

citizen o f' the United States, residingl at Brooklyn, New York, have invented'certain new and useful Improvements in Mui'ers, of which the following is a clear, full, and exact description. L v

This invention relates'to sound mufliing or silencing devices, a flers intended for muiing the exhausts-from internal combustion engines. e

A general object of thelnvention is to increase the eiiiciency of mufilers for' all of the uses for which they are intended, and pafticularlv to provide a muler whichnot only will reduce the noise from the exhaust to a minimum but which will exert also a minimum of back ressure upon the engine.

Another object of the invention is to *provide a, muiiier in which ladjustments may be made either to regulate the extent ofv its muliling effect or to vary the amount -of back pressure `wh ich it exerts.

The invention aims particularly so to conen it is applied to an struct a muffler that w engine of the approximate `size or type for which it is intended that it may be adjusted to adapt it for variations from the conditions which were taken into consideration in its design. Y

An important feature-of the invention is the arrangement in a muiilerof a series of overlapping concentric cylindrical baiies so l that these baies may bel moved relatively to vary the relative capacities of the' successive expansion chambers or to vary the length of the path of travel ofthe exhaustgases through the muiiler. .Another important feature of the invention isthe provision ofmeansfor dischargin a variable proportion of the exhaust gases irectl into the last of aseries of expansion cham ers'.

Other objects and important features-.of the invention will "appear from the'following description and claims .when considered in connection with the accompanying drawings, in which-.-

Figure 1 is a longitudinal section of a i mufier embodying the, invention,`on the line 1-1 of Fig. 2;

Fig. 2 is a ri ht-hand end view ofthe muer; F

Fig. 3 is a transverse section on the lin 3-3 of Fig. 1; v

Fig. 4 is a transverse section on the line lf3-4 of Fig. l;

and particularly to mufspcincau'on of Letters rasant.A Patented Jan, 14, 1919 l plantation ined Beamter '27, 191s. serialm. 139,213. Y i i.

I 5 is a sectional detail of the left-'hand i. end of the muler on the line .5-5 of Fig. 4;

and l j Fig. 6 is a sectional detail'of the righthand end ofthe muiiier on the-line 6-6 of' cal ba e 4, 'the casing 2 'having an enlargement 6 at its end, l'into which are tapped the holes for the screws 8 bywhich the end i 10 is attached to the casing.

The exhaust gases from `the engine are casing 2 through a tube 12,.which is screwed .into an inlet opening 14 in the integral end of the'ca'sing 2, the tube being threadedV a suiiicientdistance from its' end to provide a projecting portion 16 for a union' or other K coupling, for connection with the engine exhaust. At its other end-'the tube 12is pro-l f' vvided with a cap 18 having a'central .openl ing through which passes 'a threaded'rod 2 0 threaded through the end 10 of. the casing and carrying at its end kwithin the tube a piston `or diaphragm 22, which lits loosely within the tube The tube12 is provided vide the casing 2 into two expansion cham# bers, this plate-as shown in Fig. S-e-being somewhat smaller than the transverse dimensions-of the inside of the casing 2, and having ears 26 through which arel threaded adjusting rods 28l by which the'. plate 24 may be moved lengthwise ofthe easing 2, to vary sion chambers into which it divides said casthe relative capacities of the two expaning. The rods 28 extend through both end walls of the casing 2 andare each provided upon one end with a head 80, and upon the other end with a head 32 and a lock-'nutv 34. -Not only does the'transverse baiiie plate 24 not extend entirely across the interior of the f casing 2 but it also Afits loosely about the.

tube 12, the opening 36 through whichI the :tube 12 passes being, as sh'own somewhat -larger than the tube, thus permitting the escape of some of the vgases throughA this opening. r.

70 conducted into theinteri'or' of vthe muiier 1 baffles 4 and 38 normally over ap to increase their action, and the extent of this overlapping and also the relative capacities of the expansion chambers within the said baffles may be varied bythe movement of the baliie 38 lengthwise of the casing 2 together wlth i the movement of the transverse baffle 24.

This movement effects a telescoping ofthe baiiles 4 and 38 and not only varies the capacities of the vexpansion chambers within said bafiies but also varies the length of the path of travel which the gases must follow as they pass from the inlet opening 14 to the exhaust or outlet opening 40, shown 1n Fig. 6. To guide and support the baille 38 in its movement of adjustment, it is provided with ears 39 having guide openings which receive the smooth portions of .the rods 28. When the muier is used as a water muiier as, for example, upon a power boat, it is preferably cooled by the passage therethrough of a stream of water which may enterthe pipe 42 and pass out of the p1pe44. If it is to be used within a smoke stack, theconnection 42 is unnecessary.

Mufilers are usually designed and built' `for englnes of particular types and of particular .horse ower ratings, or at least for engines w1t 1n a certain range of horse power ratings, but 1t is found in practice that two engines of the Vsame ratings may;

vary considerably in their actual performance. When muiilers of the same design are attached to different engines, it is found that both the mufliing effect of the muiiiers varies and also their effect upon the engines with respect to back pressure. As hereinabove suggested, a principal object of the invention 'is to overcome these conditions 'and to produce a muiiler that is adaptable within certain limits 4to compensate for varying conditions presented by different gmes-of the same type or rating.

From the foregolng description it' will be seen that aliadjustment ofthe baile plate 24 varies the relativecapacities of the successive expansion chambers ,through which the gases discharged from the tube 12 must pass before they reach the exhaust 40,'tl1us varying.. at the same time both the muiing effect and the back p ressure upon the engine. The discharge o f the'gases from the tube 12 may also be .controlled to some extentby means of the piston or diaphragm 22, which is adjustable lengthwise of said tube by means of th'e rod 20 and which may be secured in any position of adjustment .by means of the lock nut 46. If it is desired to'. discharge some of the. gases directly into the last of the series of expansion chambers, the diaphragm 22 will be moved toward the right of Fig.' 1, uncovering some of thev openings 23 beyond the baille. plate 24. AWith the "two adjustments just described, substan- 7 0 tially any conditionsl within the normal range of. variations to be found in engines of the type for which the muffler is particularly designed may be cared for.

i It will be understood that the invention is not restricted to the particular arrangement of Abailles, tothe particular means for introducing the gases into the expansion chambers nor tothe particular means for securing the adjustments? What l claim as new is 1. A muffler comprising an elongatedl casing having an exhaust opening at one end, a transverse baiie plate in said casing adjustable lengthwise thereof to vary the relative capacities of the expansion chambers into which said Vplate divides the interior of said casing, and meansv connected with the end of said casing remote from said exhaust and extending through said bale plate l90 for conducting the gases-to be dischar ed -into said4 casing, 'said means having ischarge openings along 'its sides so arranged that a variable proportion ofthe gases are A discharged into the respective chambers, as 95 said baille plate is 4adjusted lengthwise of saidcasing. f

j 2. A muiiier comprising an elongated casing having an exhaust'opening at one end, a transverse baiiie dividing 'the interior of said casing into a plurality of` expansion Chambers and adjustable lengthwisel of said casing -to vary vthe relative capacities-of said chambers, overlapping cylindrical bales upon the side of said transverse baille re mote from said exhaust opening, one of said cylindrical baflies being connected to said transverse baille Aand another being vconnected'to the-end wall of said casing, and` means for introducing lthe gases into said casing comprising a perforated tube extending through said transverse baille and having perforations upon both sides of said baiiie, and a diaphragm in said tube ad-v Kjustable ylengthwise thereof.

3. A muillercomprising an elongatedcasing having an exhaust opening at one end, a transverse baille dividing the interior o-f said casing into a plurality of expansion' chambers and adjustable lengthwise-of said 120 casing to vary the relative capacities of said chambers, overlapping cylindrical 'baiiies upon the sides of said transverse baille remote from said exhaust opening, one of said cylindrical baiiies being connected to said '125 transverse baiile and another `being connected to the end wall of said casing, means for introducing the gases-into said casing comprising a perforated tube extending through said ltransverse baiie and having'l30 perforations upon both sides of said bafie, Signed at New York city, Ni Y., this 23 i zt diaphragm in said tube adjustable lengthday o'f December, 1916.

wise thereof, and means extending to the exv THOMAS T. TVEDT.

terior of said casing for effecting the ad-- Witnesses: 5 justment of saidtransverse bae and of said BEATRICE MIRVIS,

diaohragm. ABRAM BERNSTFIN. 

